mirror of
https://sourceware.org/git/glibc.git
synced 2024-12-11 05:40:06 +00:00
391 lines
12 KiB
C
391 lines
12 KiB
C
/* Initialization code run first thing by the ELF startup code. For i386/Hurd.
|
|
Copyright (C) 1995,96,97,98,99,2000,01,02,03,04 Free Software Foundation, Inc.
|
|
This file is part of the GNU C Library.
|
|
|
|
The GNU C Library is free software; you can redistribute it and/or
|
|
modify it under the terms of the GNU Lesser General Public
|
|
License as published by the Free Software Foundation; either
|
|
version 2.1 of the License, or (at your option) any later version.
|
|
|
|
The GNU C Library is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
Lesser General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Lesser General Public
|
|
License along with the GNU C Library; if not, write to the Free
|
|
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
|
|
02111-1307 USA. */
|
|
|
|
#include <assert.h>
|
|
#include <hurd.h>
|
|
#include <stdio.h>
|
|
#include <unistd.h>
|
|
#include <string.h>
|
|
#include <sysdep.h>
|
|
#include <set-hooks.h>
|
|
#include "hurdstartup.h"
|
|
#include "hurdmalloc.h" /* XXX */
|
|
#include "../locale/localeinfo.h"
|
|
|
|
#include <ldsodefs.h>
|
|
#include <fpu_control.h>
|
|
|
|
extern void __mach_init (void);
|
|
extern void __init_misc (int, char **, char **);
|
|
#ifdef USE_NONOPTION_FLAGS
|
|
extern void __getopt_clean_environment (char **);
|
|
#endif
|
|
#ifndef SHARED
|
|
extern void _dl_non_dynamic_init (void) internal_function;
|
|
#endif
|
|
extern void __libc_global_ctors (void);
|
|
|
|
unsigned int __hurd_threadvar_max;
|
|
unsigned long int __hurd_threadvar_stack_offset;
|
|
unsigned long int __hurd_threadvar_stack_mask;
|
|
|
|
#ifndef SHARED
|
|
int __libc_enable_secure;
|
|
#endif
|
|
int __libc_multiple_libcs attribute_hidden = 1;
|
|
|
|
extern int __libc_argc attribute_hidden;
|
|
extern char **__libc_argv attribute_hidden;
|
|
extern char **_dl_argv;
|
|
|
|
void *(*_cthread_init_routine) (void); /* Returns new SP to use. */
|
|
void (*_cthread_exit_routine) (int status) __attribute__ ((__noreturn__));
|
|
|
|
/* Things that want to be run before _hurd_init or much anything else.
|
|
Importantly, these are called before anything tries to use malloc. */
|
|
DEFINE_HOOK (_hurd_preinit_hook, (void));
|
|
|
|
|
|
/* We call this once the Hurd magic is all set up and we are ready to be a
|
|
Posixoid program. This does the same things the generic version does. */
|
|
static void
|
|
posixland_init (int argc, char **argv, char **envp)
|
|
{
|
|
__libc_multiple_libcs = &_dl_starting_up && !_dl_starting_up;
|
|
|
|
/* Make sure we don't initialize twice. */
|
|
if (!__libc_multiple_libcs)
|
|
{
|
|
/* Set the FPU control word to the proper default value. */
|
|
__setfpucw (__fpu_control);
|
|
}
|
|
|
|
/* Save the command-line arguments. */
|
|
__libc_argc = argc;
|
|
__libc_argv = argv;
|
|
__environ = envp;
|
|
|
|
#ifndef SHARED
|
|
_dl_non_dynamic_init ();
|
|
#endif
|
|
__init_misc (argc, argv, envp);
|
|
|
|
#ifdef USE_NONOPTION_FLAGS
|
|
/* This is a hack to make the special getopt in GNU libc working. */
|
|
__getopt_clean_environment (envp);
|
|
#endif
|
|
|
|
#ifdef SHARED
|
|
__libc_global_ctors ();
|
|
#endif
|
|
}
|
|
|
|
|
|
static void
|
|
init1 (int argc, char *arg0, ...)
|
|
{
|
|
char **argv = &arg0;
|
|
char **envp = &argv[argc + 1];
|
|
struct hurd_startup_data *d;
|
|
#ifndef SHARED
|
|
extern ElfW(Phdr) *_dl_phdr;
|
|
extern size_t _dl_phnum;
|
|
#endif
|
|
|
|
while (*envp)
|
|
++envp;
|
|
d = (void *) ++envp;
|
|
|
|
/* If we are the bootstrap task started by the kernel,
|
|
then after the environment pointers there is no Hurd
|
|
data block; the argument strings start there. */
|
|
if ((void *) d == argv[0])
|
|
{
|
|
#ifndef SHARED
|
|
/* We may need to see our own phdrs, e.g. for TLS setup.
|
|
Try the usual kludge to find the headers without help from
|
|
the exec server. */
|
|
extern const void _start;
|
|
const ElfW(Ehdr) *const ehdr = &_start;
|
|
_dl_phdr = (ElfW(Phdr) *) ((const void *) ehdr + ehdr->e_phoff);
|
|
_dl_phnum = ehdr->e_phnum;
|
|
assert (ehdr->e_phentsize == sizeof (ElfW(Phdr)));
|
|
#endif
|
|
return;
|
|
}
|
|
|
|
#ifndef SHARED
|
|
__libc_enable_secure = d->flags & EXEC_SECURE;
|
|
|
|
_dl_phdr = (ElfW(Phdr) *) d->phdr;
|
|
_dl_phnum = d->phdrsz / sizeof (ElfW(Phdr));
|
|
assert (d->phdrsz % sizeof (ElfW(Phdr)) == 0);
|
|
#endif
|
|
|
|
_hurd_init_dtable = d->dtable;
|
|
_hurd_init_dtablesize = d->dtablesize;
|
|
|
|
{
|
|
/* Check if the stack we are now on is different from
|
|
the one described by _hurd_stack_{base,size}. */
|
|
|
|
char dummy;
|
|
const vm_address_t newsp = (vm_address_t) &dummy;
|
|
|
|
if (d->stack_size != 0 && (newsp < d->stack_base ||
|
|
newsp - d->stack_base > d->stack_size))
|
|
/* The new stack pointer does not intersect with the
|
|
stack the exec server set up for us, so free that stack. */
|
|
__vm_deallocate (__mach_task_self (), d->stack_base, d->stack_size);
|
|
}
|
|
|
|
if (d->portarray || d->intarray)
|
|
/* Initialize library data structures, start signal processing, etc. */
|
|
_hurd_init (d->flags, argv,
|
|
d->portarray, d->portarraysize,
|
|
d->intarray, d->intarraysize);
|
|
}
|
|
|
|
|
|
static inline void
|
|
init (int *data)
|
|
{
|
|
int argc = *data;
|
|
char **argv = (void *) (data + 1);
|
|
char **envp = &argv[argc + 1];
|
|
struct hurd_startup_data *d;
|
|
unsigned long int threadvars[_HURD_THREADVAR_MAX];
|
|
|
|
/* Provide temporary storage for thread-specific variables on the
|
|
startup stack so the cthreads initialization code can use them
|
|
for malloc et al, or so we can use malloc below for the real
|
|
threadvars array. */
|
|
memset (threadvars, 0, sizeof threadvars);
|
|
threadvars[_HURD_THREADVAR_LOCALE] = (unsigned long int) &_nl_global_locale;
|
|
__hurd_threadvar_stack_offset = (unsigned long int) threadvars;
|
|
|
|
/* Since the cthreads initialization code uses malloc, and the
|
|
malloc initialization code needs to get at the environment, make
|
|
sure we can find it. We'll need to do this again later on since
|
|
switching stacks changes the location where the environment is
|
|
stored. */
|
|
__environ = envp;
|
|
|
|
while (*envp)
|
|
++envp;
|
|
d = (void *) ++envp;
|
|
|
|
/* The user might have defined a value for this, to get more variables.
|
|
Otherwise it will be zero on startup. We must make sure it is set
|
|
properly before before cthreads initialization, so cthreads can know
|
|
how much space to leave for thread variables. */
|
|
if (__hurd_threadvar_max < _HURD_THREADVAR_MAX)
|
|
__hurd_threadvar_max = _HURD_THREADVAR_MAX;
|
|
|
|
|
|
/* After possibly switching stacks, call `init1' (above) with the user
|
|
code as the return address, and the argument data immediately above
|
|
that on the stack. */
|
|
|
|
if (_cthread_init_routine)
|
|
{
|
|
/* Initialize cthreads, which will allocate us a new stack to run on. */
|
|
int *newsp = (*_cthread_init_routine) ();
|
|
struct hurd_startup_data *od;
|
|
|
|
void switch_stacks (void);
|
|
|
|
/* Copy per-thread variables from that temporary
|
|
area onto the new cthread stack. */
|
|
memcpy (__hurd_threadvar_location_from_sp (0, newsp),
|
|
threadvars, sizeof threadvars);
|
|
|
|
/* Copy the argdata from the old stack to the new one. */
|
|
newsp = memcpy (newsp - ((char *) &d[1] - (char *) data), data,
|
|
(char *) d - (char *) data);
|
|
|
|
#ifdef SHARED
|
|
/* And readjust the dynamic linker's idea of where the argument
|
|
vector lives. */
|
|
assert (_dl_argv == argv);
|
|
_dl_argv = (void *) (newsp + 1);
|
|
#endif
|
|
|
|
/* Set up the Hurd startup data block immediately following
|
|
the argument and environment pointers on the new stack. */
|
|
od = ((void *) newsp + ((char *) d - (char *) data));
|
|
if ((void *) argv[0] == d)
|
|
/* We were started up by the kernel with arguments on the stack.
|
|
There is no Hurd startup data, so zero the block. */
|
|
memset (od, 0, sizeof *od);
|
|
else
|
|
/* Copy the Hurd startup data block to the new stack. */
|
|
*od = *d;
|
|
|
|
/* Push the user code address on the top of the new stack. It will
|
|
be the return address for `init1'; we will jump there with NEWSP
|
|
as the stack pointer. */
|
|
*--newsp = data[-1];
|
|
((void **) data)[-1] = switch_stacks;
|
|
/* Force NEWSP into %ecx and &init1 into %eax, which are not restored
|
|
by function return. */
|
|
asm volatile ("# a %0 c %1" : : "a" (newsp), "c" (&init1));
|
|
}
|
|
else
|
|
{
|
|
/* We are not using cthreads, so we will have just a single allocated
|
|
area for the per-thread variables of the main user thread. */
|
|
unsigned long int *array;
|
|
unsigned int i;
|
|
int usercode;
|
|
|
|
void call_init1 (void);
|
|
|
|
array = malloc (__hurd_threadvar_max * sizeof (unsigned long int));
|
|
if (array == NULL)
|
|
__libc_fatal ("Can't allocate single-threaded thread variables.");
|
|
|
|
/* Copy per-thread variables from the temporary array into the
|
|
newly malloc'd space. */
|
|
memcpy (array, threadvars, sizeof threadvars);
|
|
__hurd_threadvar_stack_offset = (unsigned long int) array;
|
|
for (i = _HURD_THREADVAR_MAX; i < __hurd_threadvar_max; ++i)
|
|
array[i] = 0;
|
|
|
|
/* The argument data is just above the stack frame we will unwind by
|
|
returning. Mutate our own return address to run the code below. */
|
|
usercode = data[-1];
|
|
((void **) data)[-1] = call_init1;
|
|
/* Force USERCODE into %eax and &init1 into %ecx, which are not
|
|
restored by function return. */
|
|
asm volatile ("# a %0 c %1" : : "a" (usercode), "c" (&init1));
|
|
}
|
|
}
|
|
|
|
/* These bits of inline assembler used to be located inside `init'.
|
|
However they were optimized away by gcc 2.95. */
|
|
|
|
/* The return address of `init' above, was redirected to here, so at
|
|
this point our stack is unwound and callers' registers restored.
|
|
Only %ecx and %eax are call-clobbered and thus still have the
|
|
values we set just above. Fetch from there the new stack pointer
|
|
we will run on, and jmp to the run-time address of `init1'; when it
|
|
returns, it will run the user code with the argument data at the
|
|
top of the stack. */
|
|
asm ("switch_stacks:\n"
|
|
" movl %eax, %esp\n"
|
|
" jmp *%ecx");
|
|
|
|
/* As in the stack-switching case, at this point our stack is unwound
|
|
and callers' registers restored, and only %ecx and %eax communicate
|
|
values from the lines above. In this case we have stashed in %eax
|
|
the user code return address. Push it on the top of the stack so
|
|
it acts as init1's return address, and then jump there. */
|
|
asm ("call_init1:\n"
|
|
" push %eax\n"
|
|
" jmp *%ecx\n");
|
|
|
|
|
|
/* Do the first essential initializations that must precede all else. */
|
|
static inline void
|
|
first_init (void)
|
|
{
|
|
/* Initialize data structures so we can do RPCs. */
|
|
__mach_init ();
|
|
|
|
RUN_HOOK (_hurd_preinit_hook, ());
|
|
}
|
|
|
|
#ifdef SHARED
|
|
/* This function is called specially by the dynamic linker to do early
|
|
initialization of the shared C library before normal initializers
|
|
expecting a Posixoid environment can run. It gets called with the
|
|
stack set up just as the user will see it, so it can switch stacks. */
|
|
|
|
void
|
|
_dl_init_first (int argc, ...)
|
|
{
|
|
first_init ();
|
|
|
|
init (&argc);
|
|
}
|
|
#endif
|
|
|
|
|
|
#ifdef SHARED
|
|
/* The regular posixland initialization is what goes into libc's
|
|
normal initializer. */
|
|
/* NOTE! The linker notices the magical name `_init' and sets the DT_INIT
|
|
pointer in the dynamic section based solely on that. It is convention
|
|
for this function to be in the `.init' section, but the symbol name is
|
|
the only thing that really matters!! */
|
|
strong_alias (posixland_init, _init);
|
|
|
|
void
|
|
__libc_init_first (int argc, char **argv, char **envp)
|
|
{
|
|
/* Everything was done in the shared library initializer, _init. */
|
|
}
|
|
#else
|
|
strong_alias (posixland_init, __libc_init_first);
|
|
|
|
|
|
/* XXX This is all a crock and I am not happy with it.
|
|
This poorly-named function is called by static-start.S,
|
|
which should not exist at all. */
|
|
void
|
|
_hurd_stack_setup (volatile int argc, ...)
|
|
{
|
|
void doinit (intptr_t *data)
|
|
{
|
|
/* This function gets called with the argument data at TOS. */
|
|
void doinit1 (volatile int argc, ...)
|
|
{
|
|
init ((int *) &argc);
|
|
}
|
|
|
|
/* Push the user return address after the argument data, and then
|
|
jump to `doinit1' (above), so it is as if __libc_init_first's
|
|
caller had called `doinit1' with the argument data already on the
|
|
stack. */
|
|
*--data = (&argc)[-1];
|
|
asm volatile ("movl %0, %%esp\n" /* Switch to new outermost stack. */
|
|
"movl $0, %%ebp\n" /* Clear outermost frame pointer. */
|
|
"jmp *%1" : : "r" (data), "r" (&doinit1) : "sp");
|
|
/* NOTREACHED */
|
|
}
|
|
|
|
first_init ();
|
|
|
|
_hurd_startup ((void **) &argc, &doinit);
|
|
}
|
|
#endif
|
|
|
|
|
|
/* This function is defined here so that if this file ever gets into
|
|
ld.so we will get a link error. Having this file silently included
|
|
in ld.so causes disaster, because the _init definition above will
|
|
cause ld.so to gain an init function, which is not a cool thing. */
|
|
|
|
void
|
|
_dl_start (void)
|
|
{
|
|
abort ();
|
|
}
|